The term 'Great Power' refers to a nation or state that has significant economic, political, and military influence in the world. The two crossword solutions for this term are 'MIGHT' (5 letters) and 'USSR' (4 letters). MIGHT is a synonym for power, strength, and authority, and is often used to describe a nation's ability to influence other nations. The USSR was a former communist state that existed from 1922 to 1991 and was one of the most powerful countries in the world during its existence.